MEXICO CITY -- Professional wrestler Rey Mysterio Jr. expressed stunned sympathy Saturday after authorities said his blow during a wrestling match the night before killed the son of a Mexican wrestling legend.

Pedro Aguayo Ramirez, known as Hijo del Perro Aguayo, fell unconscious on the ropes Friday after receiving a flying kick from Mysterio, according to video of the match in a municipal auditorium in Tijuana, Mexico.